云南腾冲热液发育模式及其对塔里木盆地热液溶蚀改造的启示  

Development pattern of hydrothermal fluids in Tengchong,Yunnan Province and its implications for hydrothermal dissolution in the Tarim Basin

作　　者：朱东亚[1] 孟庆强[1] 解启来[2] 金之钧[1] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]华南农业大学资源环境学院,广东广州510640

出　　处：《石油与天然气地质》2010年第3期327-334,共8页Oil & Gas Geology

基　　金：国家重大专项(2008ZX05005-001-006);国家自然科学基金项目(40872088);中石化海相前瞻性项目(YPH08072)

摘　　要：通过对云南腾冲热液流体形成机制的研究，探讨了塔里木盆地热液活动的特征。研究表明，腾冲温泉气体中CO2的δ^13C（PDB）位于-6．4‰～-4．7％。之间，^3He／^4He比值位于1．09～3．51之间；温泉热液氢、氧同位素组成在大气降水线附近，但向氧同位素偏重的方向偏移。研究认为，腾冲温泉气体主要来自深部地幔，而温泉热液主要是大气降水下渗并受深部热源加热后再向上循环的产物。根据塔里木盆地构造演化特点，认为在二叠纪末期塔北沙雅一轮台断裂和亚南断裂带附近有类似于腾冲的地质条件，大气降水下渗相关的热液流体活跃，对下古生界碳酸盐岩形成强烈的溶蚀改造作用；但塔中、巴楚以及塔北隆起南部斜坡区则没有类似的地质条件，热液溶蚀改造作用都相对较弱。Based on the study of the development pattern of hydrothermal fluids in Tengchong, Yunnan Province, we discuss characteristics of hydrothermal activities in Tarim Basin. According to the study, the 813C （PDB） values of the CO2 in the hot spring gases in Tengchong are between -6.4‰ and -4. 7‰, and the 3He/4He ratios are between 1.09 and 3.51. The compositions of oxygen and hydrogen isotopes in hydrothermal fluids from hot spring are similar with those in meteoric water, but the oxygen isotopes show a tendency of getting heavier in their mass. Based on the study, we believe gases from hot spring in Tengchong mainly come from deep mantle, while hydrothermal fluids originate from rainfall, which infiltrates downwards and is heated by deep heat sources and then goes upwards. According to the features of structural evolution of Tarim Basin, we believe the Shaya- Luntai and the Yanan faulted zones in northern Tarim Basin in Late Permian had similar geological conditions with those in Tengchong today. Under these conditions, hydrothermal fluids originating from the downward infil- tration of meteoric water were active and strongly dissolved carbonates in the Lower Paleozoie. On the contrary, there were no similar geological conditions in the Tazhong area, the Bachu area and the southern slope zone in the Tabei uplift, and thus hydrothermal dissolution was relatively weaker.

关 键 词：热液 碳酸盐岩 溶蚀改造 云南腾冲 塔里木盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]